BS EN 62040-5-3:2017

What is BS EN 62040-5-3 – Uninterruptible power systems about?

BS EN 62040-5-3 is a standard that discusses the performance and test requirements of DC output UPS. UPS is a device that provides battery backup when the electrical power fails or drops to an unacceptable voltage level.

BS EN 62040-5-3 establishes the performance and test requirements applied to movable, stationary and fixed electronic DC uninterruptible power systems (DC UPS) that

• Are supplied from an AC voltage source not exceeding 1 000 V
• Deliver a DC output voltage not exceeding 1 500 V
• Incorporate an energy storage device, and
• Have a primary function to ensure continuity of DC power to loads.

BS EN 62040-5-3 specifies performance and test requirements of a complete DC UPS and not of individual DC UPS functional units. The individual DC UPS functional units are dealt with in IEC publications referred to in the bibliography that apply so far that they are not in contradiction with BS EN 62040-5-3.

BS EN 62040-5-3 also includes DC UPS performance and test requirements related to interrupters, isolating switches, and tie switches, if any, which are integral to the DC UPS. These components interact with other functional units of the DC UPS to maintain continuity of load power.

NOTE: BS EN 62040-5-3 does not cover:

• Conventional AC input distribution boards and their associated switches
• Conventional DC distribution boards and their associated switches
• Conventional AC UPSs covered by IEC 62040-3
• Low-voltage DC power supply devices covered by a specific product standard, for example, IEC 61204, and those covered by a specific product standard, for example, ITU communication standards, and
• Systems wherein the output voltage is derived from a rotating machine.

Who is BS EN 62040-5-3 – Uninterruptible power systems for?

BS EN 62040-5-3 on DC output UPS applies to:

• Manufacturer of UPS products
• Electrical engineers
• Quality testing personnel

Why should you use BS EN 62040-5-3 – Uninterruptible power systems?

DC UPS is a combination of converters, switches and energy storage devices (such as batteries), constituting a power system for maintaining continuity of DC load power in case of AC input power failure.

BS EN 62040-5-3 provides guidance regarding load tests that helps you in performing load tests by connecting loads to the DC UPS output to simulate representative actual load conditions, or by connecting the actual load when available. It also provides a routine test which is performed on each DC UPS to verify that the requirements of BS EN 62040-5-3 are met. Routine tests are generally performed before delivery, at the manufacturer’s premises.

BS EN 62040-5-3 exemplifies tests that are intended to simulate the environmental and transportation requirements the DC UPS is designed to meet. The transportation-related tests assess the construction of the DC UPS in the shipping container against resistance to damage by normal handling operations during transportation.

As a user of BS EN 62040-5-3, you can be ensured of the performance and test requirements for DC output UPS. In this manner, you can achieve precision in terms of product functionality.

What’s changed since the last update?

BS EN 62040-5-3:2017 is identical to IEC 62040-5-3:2016. It includes:

• Requirements proper and normative annexes: in roman type
• Compliance statements and test specifications: in italic type
• Notes and other informative matter: in smaller roman type
• Normative conditions within tables: in smaller roman type
• Terms that are defined in Clause 3: bold.